SwingTimerBasedAnimationScaleRotate.java Source code

Introduction

Here is the source code for SwingTimerBasedAnimationScaleRotate.java

Source

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

public class SwingTimerBasedAnimationScaleRotate extends JPanel implements ActionListener {
    Timer timer;
    private double angle = 0;
    private double scale = 1;
    private double delta = 0.01;
    Rectangle.Float r = new Rectangle.Float(20, 20, 200, 200);

    public SwingTimerBasedAnimationScaleRotate() {
        timer = new Timer(10, this);
        timer.start();
    }

    public void paint(Graphics g) {
        int h = getHeight();
        int w = getWidth();

        Graphics2D g2d = (Graphics2D) g;

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);

        g2d.translate(w / 2, h / 2);
        g2d.rotate(angle);
        g2d.scale(scale, scale);

        g2d.fill(r);
    }

    public static void main(String[] args) {

        JFrame frame = new JFrame("Moving star");
        frame.add(new SwingTimerBasedAnimationScaleRotate());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(420, 250);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {

        if (scale < 0.01) {
            delta = -delta;
        } else if (scale > 0.99) {
            delta = -delta;
        }

        scale += delta;
        angle += 0.01;

        repaint();
    }
}